Addis, Sinead2026-03-132026-03-132025-12Addis, S. (2025). Managing invasive species in Nova Scotia: public perceptions of smallmouth bass (Micropterus dolomieu) retention in the Margaree Valley [graduate project]. Halifax, NS: Dalhousie University.https://hdl.handle.net/10222/85890Marine Affairs Program Master of Marine Management Graduate ProjectFreshwater ecosystems, dynamic and complex environments rich with biodiversity, are threatened by aquatic invasive species. In Nova Scotia, smallmouth bass is a well-known aquatic invasive species found in over half of the province’s watersheds. In an attempt to reduce the spread of smallmouth bass populations, in 2024, the Provincial Government implemented a mandatory retention order in the Margaree River watershed, Cape Breton. The effectiveness of such management efforts often hinges on public acceptance and compliance; however, the degree to which anglers and the community are accepting of and complying with the retention order is unknown. This study explores local perceptions of the retention order by utilizing semi-structured and structured interviews guided by Ostrom’s social-ecological systems framework. The results indicate that support for mandatory retention as a management strategy was strong, although not universal. The retention order was viewed as a tool that could help support and maintain ecosystem balance by reducing smallmouth bass biomass in the watershed, thereby benefiting native species. Yet the order was simultaneously criticized both for its rushed implementation and lack of stakeholder engagement. It was also criticized for being implemented too late after the initial introduction of the species to the region, limiting its ability to have any real impact on the population. Importantly, social and ecological variables were interconnected by moral value conflicts, where personal values often conflicted with conservation goals. This research provides valuable insights for developing effective invasive species management plans and underscores the importance of incorporating human dimensions into biological invasion research and management decisions.smallmouth basssocial-ecological systemrecreational fisheriesfisheries managementaquatic invasive species